Power molding press



Sept. 15, 1936. .1. DERRY ET AL. 2,054,476

POWER MOLDING PRESS Filed May 3l, 1934 `5 Sheets-Sheet l Sept- 15, 1936- J. DERRY ET AL POWER MOLDING PRESS Filed May 5l, 1934 5 Sheets-Sheet 2 Sept. 15, 1936. J. DERRY ET Al.

POWER MOLDING PRESS 5 Shets-Sheet 3 Filed May 31, 1934 A E93. WW 11 wcnor.;

Jaspererry,

Sept. 15, 1936. J. DERRYET ,M v 2,054,476

POWER MOLDING PRESS Filed May 51, 1934 5 Sheets-Sheet 4 Inventors:

Jaspererry, wnlrkelsen,

bum@

. 'Z'mzenors:

Jaspererry,

5 Sheets-Sheet 5 J. DERRY ET Al.

Filed May 51, 1954 POWER MOLDING PRESS l Asept. 15, 1936.

Patented Sept. 15, 1936 UNITED s'm'rlazsv PATENT OFFICE' POWER MOLDING PRESS I Application May 31, 1834. Serial No. 728,320

12 Claims. (Cl. 18-17) This 'invention relates to molding presses and more particularly to presses of this` character in which thermo-plastic molding material is fed to molds subjected to heat, and then compressed in the molds while heated and in a coalesced condition, the main object of the invention being the provision of a machine which will operate automatically with all the operations of the working parts thereof synchronized.I

l0 Another object of the invention is the prevention of any downward movement of the ram or die head until the loading operation has been completed.

A further object of the invention is the provision of means whereby a follow-up pressure may be given to the molded articles after lthe initial pressure imparted thereto by movement of the separable molds toward each other.

These objects are attained by the mechanism` 2o illustrated in the accompanying drawings.

For the purpose of illustrating the invention, one preferred. form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized. andthe invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described except as required by the scope of the appended claims.

Of the drawings A Figure 1 represents a front elevation of a press embodying the principles vof the present invention.

Figure 2 representsI a right side elevation of the same.

Figure 3 represents a horizontal section of a portion of the press on line 3, 3 on Fig. 4. Figure 4 represents a vertical section on line l, 4 on Fig. 3.

Figure 5 represents a vertical transverse section on line 5, 5 on Fig. 4.

Figure 6 represents an enlarged front elevation of a portion of the press.

Figure 7 represents a detail in section showing the means for stopping the downward movement of the die head.

Figure 8 represents a detail showing the electric contacts for operating a signal lamp.

Figure 9 represents a detail showing the means of indicating the pressure whi'ch the die head is adapted to give during the molding operation. and

Figure 10 represents diagrammatically the electrically operated devices and wires connectlng the same.

Similar characters indicate like parts throughout the several gures of the drawings.

In the drawings. I0 is a press bed having sur- 5 mounted thereon and secured thereto a press frame II.

To the rear of the bed I0 is secured a shelf I2 having surmounted thereon an electric motor I3, the shaft I4 of which is connected in any 10 well known manner to a worm shaft I5 having a worm I8 mounted thereon in a casing I1 in which is enclosed a worm gear I8 meshing with said worm I8.

The motor I3 and worm reduction gearing I5, 15 I8 are of usual construction and need not be illustrated-in detail.

Associated with the motor I3 is a magnetic brake I8 of usual construction, said brake being adapted to control the starting and stopping op- 20 eration ofsaid motor.

The worm gear I8 is secured to a shaft 20 rotatably mounted in bearings formed in said casing I1 and having secured thereto a sprocket wheel 2l.

The casing Il is mounted upon a base 22 secured to the upper face of the bed I0.

The sprocket wheel 2| is connected by a sprocket chain 23 with a sprocket wheel 24 secured to one end of a shaft 25 rotatably mounted in the 30 press frame Il. .g

The opposite end of said shaft 25 has secured thereto a pinion 26 meshing with a large gear 2l secured to a shaft 28 rotatable in bushings 28 in the upper end of the press frame II. 35

'I'he shaft 28 has formed thereon intermediate its end pinion teeth 29a: which mesh with rack teeth 30 formed upon a plunger 3l movable vertically in an elongated bearing formed in a forward projection 32 on the upper end of said press 40 frame II.

lThe lower end of the press frame II has a forward extension 33 which is connected at its forward end by means of a tie rod 33.1: with th forward end of the projection 32. 45

'I'he forward projection 33 forms a platen on which rests the lower mold 34.

Surrounding the lower end of the plunger 3l is an upper die head 435 having oppositely disposed ears 38 through which extend guide rods 50 31 having collars 38 adjustably mounted thereon and secured thereto. -v

Between these collars 38 and the ears 36 are springsl 38.

- The lower ends of the guide rods 3l are se- 55 'usl cured to a cross plate 43 beneath the die head 35.

Depending from the die head35 are rods 4| having rails 42 adjustably mounted` on their lower ends, these rails forming supports for the upper mold 43.

The plunger 3| and die head 35 form a ram adapted to move the upper half 32 of the separable mold to and from the lower half 34 of said mold.

'I'he molds 34 and 43 are provided with chambers 44 therein to which ysteam or other heating element is admitted from any suitable source through the pipes 45, thuskeeping the molds heated during the molding operation.

'I'he cross plate 43 is movable between the upper mold 43 and the die head 35 and the vertlcal guide rods 31 extend upwardly therefrom througlrears 33 on the die head 35.

'I'he springs 33 between the ears 33 and collars 33 under normal conditions retain the plate 43 in contact with the under `face of head 35, as shown in Fig. 1. l

Above the collars 33 and surrounding the rods 31 are collars 43 adjustably secured to said rods and resting on these collars 43 are sleeves 41.

In the upward movement of the diehead 35 the upper end of the sleeves 41 come into contact with the ears 43`on the framell and stop the upward movement of said rods 31, thereby causing the plate 43 to be brought into contact with the upper face of the mold 43, as shown in Fig. 6. The bar or plate 43 has extending downwardly therefrom two kick-oil pins 43 extending through Within the chamber 52 is a powerful compression spring 55 capable of sustaining great pressure, the exact pressure being indicated by the scale 53 on the cap 53 and the pointer 51 secured to said die head 35. l

Secured to the forward extension or platen 33 are vertical members 58 adapted to limit the downward movement of the die head 35.

The lower mold 34 rests on blocks 53 and has side flanges 63 over which extend clamping members 3| secured to the platen 33 by bolts 32.

Between the upper mold 43 and the bottom of die head 35 are clamped blocks 43a and 43h.

Extending through the lower end of plunger 3| is a transverse pin 33, the ends of which are disposed in vertical slots 34 in the lower end of the die head 35, thus permitting relative movement between said head and plunger while preventing rotation of either memberrelatively to the other.

The plunger 3| is iltted to a hole in the bottomfof the die head 35.

'I'he compression spring 55 is adapted to give a desired follow-up pressure to the molded articles after the initial pressure thereof has been completed by the separable molds 34. 43.

During the molding operation the lower ends of pins 43 are flush with dies 53 and coact therewith.

The depressions 5| in the lower part 34 of the separable mold may be of any required shape and the die members 53 in the upper part 43 of the mold are shaped to conform to the shape of the cavities 5I, said dies being adapted to force the molding material into all the spaces between the dies 53 and the walls of said depressions 5|.

To the front of the base |3 is secured another shelf 33 on which is mounted an electric motor 31, the shaft of which is provided with a worm 33 meshing with a worm gear 33 on a transverse shaft 13 having a crank disk 1| secured to its rear end.

Associated with the motor 31 is a magnetic brake 33.1: of usual construction, said brake being adapted to control the starting and stopping operation of said motor.

From `the shelf 33 extends anarm 12 to the outer end of which is pivoted a rocker lever 13, the upper end of which is pivotally connected to a loading plate 14 adapted to be reciprocated endwise beneath anv open ended hopper 15 adapted to contain the material to be used in the molding operation.

1 This hopper 15 is xedly secured to frame by brackets 13, 131:, and has horizontal side flanges 11 on which reciprocate U-shaped mem- 'bers 13 secured to the opposite sides of the loading plate 14.

The lever 13 is connected by a link 13 to the crank disk 1|.

At each rotation of the crank disk 1| the loading plate 14 will be reciprocated beneath the hopper 15.

'I'his loading plate 14 is provided with openings 13 therein to receive a limited quantity of molding material as the said plate is moved to the left beneath the lower open end of the hopper 15.

'Ihese openings 13 extend through the loading plate 14 and are closed at the bottom by a bottom plate 33 which is connected to said loading plate in ya manner to be hereinafter described whereby the bottom plate 33 will move a limited distance with the loading plate and then be disconnected therefrom When the openings 13 in the loading plate are positioned over the lower mold 34, thereby permitting the material in said pockets 13 to drop into the depressions 5| in the lower mold 34.

The hopper 15 is provided with a closing cover 32.

The die members 53 on the upper part 43 of the mold register with the openings 13 in the horizontally actuated slide 14 when said slide is at the extreme of its inward movement.

The bottom plate 33 moves with the slide 14 until the openings 13 in the slide 14 are nearly over the cavities or depressions 5| and then the bottom plate 33 ismoved from beneath the slide 14 to permit the molding material to drop into `said depressions 5| prior to the downward movement of the dies 53.

The loading plate or slide 14 has at its outer end two downwardly extending pins 33 between which and two eyes 33x on the bottom plate 33 are springs 34 which are adapted to retract said plate 33 when the plate is released from the slide or loading plate 14.

Pivoted at 35 on two ears on the bottom plate is latch 33. one end oi' which is provided with a hook 31 coacting with a lug 31x on the under side of the slide 14 so that when said slide moves toward its loading position, the latch 33 is caused to engage with the lug 31a: when they are opposite each other by means of the flat spring 32.

Thebottom plate being retained from horizontal movement by the adjustable stop 9| causes the springs 84 to be expanded at all times, when the slide 14 moves the bottom plate 90 toward the loading position the springs 84 are further expanded.

"I'he latch 86 has a downward arm 88 which at a point near the end of the inward movement of the loading plate 14 contacts with the adjustable stop member 89 on the bracket 90 secured to the side of the extension 33 and moves the latch 89 about its pivot 95.

When the latch 86 is thus moved about its pivot the bottom plate 80 is unlocked from loading plate lll, thereby permitting the bottom plate B0 to be returned by springs 94 to a position in contact with the adjustable stops 9| at the outer end of thebracket 90.

The latch 9B is retained normally in locked position by the flat spring 92 secured to bottom plate 80.

In the loading plate 'i4 are inserted tubular members 92a: preferably of wood and having the openings 19 therein.

Wood is preferably used for these members as the molding material does not stick thereto and better results are therefore attained.

The members 92 are secured in position by the screws 93- threaded to the slide or loading plate 14.

Pivotally mounted on the front oi the press at 94 is a delivery chute 95 having at its rear end an upwardly extending brush 96.

After they articles have been molded and the plunger 3| has moved upwardly a sufficient distance to admit this delivery chute 95 between the two parts 34. 43 of the mold, the chute 95 is moved about the axis of its pivot member 94 causing the brush 99 to wipe of! any surplus molding material remaining on the upper part 43 of the mold.

When the dies 50 move upwardly the molded articles adhere thereto and movel upwardly therewith a sufficient distance to allow the chute 95, while in horizontal position, to be moved beneath the dies 50 and the molded articles thereon.

The kick-off pins 49 force the molded articles from the dies 50 into the chute 96 and then the chute swings about the axis of its pivot member 94 toward the front of the machine where it is tilted to allow the molded articles to move down the inclined surface of the chute 95 into one or more receptacles in position to receive the same.

Where two articles are being molded at the same time, one being the bottom of a box and the other the top of the box, it is preferable to have two passages 91, 98 near the delivery endv of said chuteso that all of the bottoms will go into one passage 91 and all of the tops into the other passage 98, thereby making it possible to deliver the bottoms into one receptacle and the tops into the other receptacle.

The pivot member 94 for said chute is a vertically movable non-rotatable square bar having a twist 99 therein, said bar fitting a square opening |00 in a lug 0| secured to a plate |02 having upwardly extending ears |03 on which the chute 95 is tiltingly mounted.

Between the plate |02 and shoulders on the lug |0| is a U-shaped support |04 secured to the extension 33 which prevents any vertical movement of the plate |02.

The upper end of the bar 94 is secured at 94a: to die head 35 and moves therewith.

This twist 99 in the square bar is so located at a point in the length thereof that in its movement through the lug 0| it will oscillate the chute 95 at the properv time to move it into position to receive the molded articles and then deliver them. The extension 33 has another member |041: projecting upwardly therefrom with a cam |05 at its upper end with which the forward end of chute engages as it moves forward and causes said chute to be tilted into the position shown in dotted linesin Fig. 6. The die head 35 has extending upwardly from y an ear 39x thereon a square bar |08 having a sleeve |01 adjustably mounted thereon which in the movement .of the die head 35 coacts with a limit switch |09 secured to the right side of the forward projection 32 of the frame.

The die head 95 also has another shorter bar |09 extending upwardly from the ear 36x and the upper end of which is bevelled, which coacts with a limit switch |091: secured to the spring cap 53.

Extending upwardly from the ear 30 is a bar ||0 having adjustably mounted thereon a member ||0a which operates a limit switch ||0b.

These limits switches |03, |09x. Y| |0b, and the feed limit switch to be hereinafter described, are of usual construction making it unnecessary tov illustrate the same in detail.

The limit switch |00 'on the upward movement of die head 35 limits the upward travel of said die head; the limit switch |09 limits the down-v ward movement of the plunger 3| and regulates the pressure of the dies 50; and the limit switch v||0b controls `the time of starting of the loading mechanism. l.

To the front end of the projection 32 is seao 'y cured a controlling device with-three push members ||2, |I3, ||4, marked Up, Down". and "Feed", these push members operating switches in an electric circuit in which are all of the magnetic brakes ,and limit switches as will v be hereinafter described.

' position 'and when in this position the push buttons ||2, H3, |I4 may be actuated to permit certain individual operations of the machine.

As this controlling device is of usual construction it is deemed unnecessaryto show the same in detail. l

From the top of the controlling device the BX` cable I3 extends to junction box ||1 on the back of the frame Il. I

One of the posts 59 has secured thereto a bracket ||9 having a contact member ||9 thereon from which a wire |20 leads to a magnetic contactor |2| which when closed lights a signal lamp |22.

The contact member I9 coacts with another contact member |23 on a bracket |24 secured to the die head 95 near the -bottom thereof and from which a wire |25 extends to a wire |29 forming a part of the magnetic reversing switch |21.

|22, another wire |29 leading from said lamp |22 to the armature |30 of the magnetic contact |2|.

A wire |3I leads fromarmature |30 to the normally closed "up" switch |32 of the controlling device on the front of projection 32.

Every time the die head 35 moves downwardly A wire |23 leads fromvthe wire |25 toV lamp to close the contact between the members H9, |23, the magnetic contacter |2| is actuated and the circuit to the lamp |22 is broken by'movement of armature |30.

When.there is too much material in cavities 5| or the molded articles are not kicked oi the dies 50, the ram will be prevented from moving to its downward limit and the members H9, |23 will not contact thereby permitting amature |30 to be inoperative and permit the lamp |22 to light.

'I'his will indicate trouble to the operator who will immediately stop the press and remove any obstruction therefrom.

In the diagram shown in Fig. l the switch in the controlling device is shown in the oiT position. v

When the switch is in this position the press may be manually operated by pressing the buttons ||2, ||3, ||4 and actuating the contacts |32, |33 and |34 coacting therewith.

In the control box I are springs forcing outwardly the buttons ||2, H3, ||4 as soon as pressure is released therefrom.

The switch ||5 is only used in the on position when the press is to be operated automatically.

The member ||0a on rod ||0 is wedge-shaped with a flat face between the inclined faces thereof, thus permitting the feed starting switch ||0b to be operated as the die head 35 moves either up or down.

On the link 19 is secured a cam |35 which normally keeps the bar |35 of feed limit switch |31 in position to close the circuit between the wires |30, |39, the magnetic brake 68a: at this time retaining the motor 61 at a standstill.

When the member ||0a passes the feed starting switch ||0b it closes the circuit between wires |40, |4i. Y

The wire |40 leads to a magnetic contactor |42 and energizes the magnet |43 thereof, causing the armature |44 to close the circuit |45 to motor 61 and brake 60x, releasing the latter and thus permitting the motor 51 to operate.

The crank 1| will then begin .to rotate and cause the cam |35 to actuate the feed limit switch |31 moving the bar |35 into position to close the circuit between wires |33, |39.

The feed starting switch ||0b is only actuated long enough to permit the-cam |35 to ride off the feed limit switch |31 and permit the completion of the feed motor circuit.

At this time when the feed limit switch circuit is broken the die head 35 is prevented from moving downwardly as the circuit between wires |39, |39 is broken.

When the cam |35 is moved to operate the feed limit switch |31 the ram may move downwardly.

In other words, the cam |35 is coacting with the feed limit switch at all times when the ram is being moved and while the feed motor circuit is out of action.

The feeding of the loading slide 14 is accomplished while the crank 1| is making a complete cycle. I

As soon as' the cam |35 has made a complete cycle, it comes to a standstill, stopping further movement of the loading slide 14 and permitting downward movement of the ram.v

The purpose of the'feed limit switch |31 is to prevent the possibility of any downward movement of the die head 35 during the loading operation. f

On the right side of the press is a time relay |49 .of usual construction *and including a selfcontained synchronized motor |41 and switch |43 which may be set for the time it is desired to cure the material and compress the work.

On the right side of the press is also a line switch |49 of any well known construction to, which a cable |50 leads from any suitable source of. power. .e Y

In connection with the time relay |40 is a magnetic contactor i 5| of usual construction which is adapted to retain the ram at a standstill in its downward position during the curing period of the molding material.

The magnetic reversing switch |21 is electrically connected to motor I3 so that it will not -operate when there is any overload on the motor.

If the overload relay is caused to function so as to break the circuit, a, reset mechanism is provided to make the switch operative again. y

'I'he magnetic contactor |5| and the magnetic reversing switch |21 are of usual construction and need not be illustrated in detail.

i 'I'he magnetic reversing switch |21 has leading thereto from the line switch |49, three line wires Ll, L2. and L3, as shown in Fig. 10.

The controller motors I3, 461, magnetic brakes I9, 68x, signal light |22, circuit contacts ||9, |23, signal light magnetic contact |2| feed motor magnetic contactor |42, time .relay |46, magnetic contactor |5|, magnetic reversing switch |21, pressure limit switch |091, feed starting switch ||0b, feed limit switch |31 and travel limit switch |08, are all electrically connected. as

illustrated in the wiring diagram shown in Fig. 10. Connected in this manner with switch 5 in on position the various operations of the dev vices are synchronized so that each will operate at the proper moment without permitting the operation of any one device conflicting with the operation of. any other device.

This permits the press to continuously operate automatically until such time as some obstacle occurs preventing the further operation of the press, at which time a warning signal will be given to the operator who will immediately stop the press.

By moving the switch us to the 61:"pos1t1on,

the press may be operated manually moving the ram upwardly by operating the switch |32, moving the ram down by operating the switch |33 or feeding the loading slide by operating the switch These switches |32, |33 and |34 are never oper-4 ated collectively when the press is being manually operated.

As soon as the existing dimculty has been overcome and the ram and loading slide 14 are in their proper positions relatively to each other, the

operator may move the switch ||5 on the on cured to the plunger 3| by means of the pins 54.

When these elements 35, 55, 3|, 53 comprising the movable ram move downwardly as a unit so that the dies 50 on the upper half 43 of the mold come in to contact with the molding material in the cavities 5| in the lower moldy 34, the continued 'l downward movement of the ram will compress the material and during this compression the die head 35 will be retarded in its downward movement while the plunger 3l and cap 53 will continue to move downwardly causing the compression of the spring 55 in the chamber 52 of. said die head 35.

When the initial compression of the material has been eiected and the plunger 3| has been stopped in its .downward movement, the spring 55 will remain under compression and the tendency of this spring to expand will give al follow-up pressure to the molding material necessary to successfully mold material subject to volumetric char :es until the die head 35 again moves upwardly a sufllcient distance to allow the full expansion of the spring.

While the molding material in the cavities 5i are being subjected to this pressure, said molding material is being cured by the steam or other heating element flowing through the passages 4d in the molds 36, Q3. v

Itwill be understood that `when the molding material is subjected to heat in the molds 34, 43 to cure the same, it becomes plastic `and flows with the particles thereof adhering to each other.

This action causes the material in the molds to occupy less space and the initial compression having been completed it is quite essential that there should be a follow up pressure to further compress the material and cause the material to fill in all the unoccupied spaces between the outer walls of dies 50, the lower yends of kick-off pins 49 and the inner walls of the cavities 5i in the lower mold 3ft.

This is accomplished by the expansion of the spring 55 which is resilient and yielding, thus p-roviding a means whereby the follow-up pressure on the material is gradual and will insure that the molding material will form a more compact and homogeneous molded article.

It has been found in practice that better results are obtained by this gradual follow-up pressure on the material than could possibly be attained by imparting a sudden pressure to the material.

When a sudden impact is made upon the molding material, a part of the material will be thrown out of the cavities which is obviously very objectionable.

In other words, it is very essential to have a follow-up pressure on the molding material after its initial compression and during the curing operation and the best results are obtainable only by having the follow-up pressure gradual.

When the die head 35`starts on its upward movement the follow-up pressure will gradually decrease until the spring 55 is again fully expanded.

It is this follow-up pressure upon the material after the initial compression ofthe molding material that permits a longer period of curing of the molding material and insures greater rigidity and strength to the molded articles.

Having thus described our invention, we claim:

1. In a molding press having a movable ram, a stationary platen and a two-part mold; an open ended hopper; a slide movable horizontally beneath the open end of said hopper and having pockets therein; means for discharging molding material at a predetermined time from said hopper into said pockets and delivering same to the mold; means for opening the press at a predetermined time; means ior ejecting molded pieces from the mold; a swinging delivery chute for transferring said molded pieces from said mold; and means for tilting said chute to discharge the molded articles from the press.

2. In a press of the character described for molding thermoplastic materials including a movable ram, a stationary platen and a two-part separable mold; a delivery chute operated synchronousiy with the travel of said ram to receive the molded pieces ejected from the upper mold and transfer said pieces into position for delivery from the press; and means for tilting said chute at a predetermined time.

3. In a press of the character described for molding thermoplastic materials including a movable ram, a stationary platen and a two-part separable mold; a delivery chute operated synchronously with the travel of said ram to receive the molded pieces ejected from the upper mold and transfer said pieces into position for delivery from the press; a support for said chute provided with a square hole having a helical twist therein; a square rod movable with said ram and having the twist therein fitting said hole.`

4. In a molding press of the character described having at its upper end a vertically movable die head; a plunger extending therethrough and imparting movement thereto; an upper mold carried thereby; a die depending therefrom; a stationary mold having a cavity to receive said die; a kick-off pin extending through said die; a cross bar above said mold having limited vertical movement on said die head and to which said kick-off pin is secured; rods extending upwardly from said cross bar and movable through ears on said die head; springs for normally retaining said cross bar in its raised position; and means on the upper ends of said rods coacting with a face on the press frame for forcing said bar downwardly when the die head moves upwardly.

5. In a molding press of the character described having at its upper endV a vertically movable die head; a plunger extending therethrough and imparting movement thereto; an upper mold carried thereby; a die depending therefrom; a stationary -mold having a cavity to receive said die; a kick-od' pin extending through said die;

a cross bar above said mold having limited verable die head; a plunger extending therethrough and imparting movement thereto; an upper mold carried thereby; a die depending therefrom; astationary mold having a cavity to receive said die; a kick-off pin extending through said die; a cross bar above said mold having limited vertical movement on said die head and to which said kick-oft.

pin is secured; rods extending upwardly from said cross bar and movable through ears on said die head; collars on said rods above said ears; springs between said ears and collars for-normally retaining said cross bar in its raised position; and adjustable sleeves on the upper ends of said rods coacting with a face of the press frame for forcing said bar downwardly when the die head moves upwardly and said sleeves contact with a shoulder on the press frame.

'7. In a press of the class described for molding thermoplastic materials; a vertically movable die head; a. mold thereon; a die projecting downwardly therefrom; means for kicking of! the 8. In a press of the class described vfor moldi ingthermoplastic materials; a vertically movable die head; a mold thereon; a die projecting downwardly therefrom; means for kicking off the molded article from said die; a swinging delivery chute movable, while in horizontal position, beneath said die prior to the kick-olf operation; and

va fixed cam member for tilting the chute when it is returned to its normal position.

9. In a` press of -the character described for molding thermo-plastic materials including a movable ram at the upper end thereof, a stationary platen and a two-part separable mold of which one part is movable with the ram and the other stationary; a delivery chute movable into position to receive the molded pieces ejected from, the upper mold and transfer said pieces from the path of said ram into position for delivery from the press; a swinging arm on which said chute is mounted; and means carried by and movable with said ram for imparting a swinging movement to said arm.

10. In a press of the character described for molding .thermo-plastic materials; a vertically movable die head at the upper end thereof; anonrotatable plunger extending therethrough and imparting movement thereto; an upper mold carried by said die head; two dies depending therefrom; a

which said kick-od pins are secured; rods extending upwardly from said cross bar and movable through ears on said die head; springs for normally retaining said cross bar in its raised position; and means on the upper ends of said rods coacting with a face of the press frame for forcing said bar downwardly when the die head moves upwardly;

l1. In a press of the character described for -molding thermo-plastic materials; a vertically movable die head at the upper end thereof; a

- nonrotatable plunger extending through the die head and imparting movement thereto; an upper mold carried by said die head; a die depending therefrom; a stationary mold having a closed cavity to receive said die; a loading slide adapted to -convey molding material to said cavity; three bars extending upwardly from said die head and movable therewith, and mechanisms associated with said bars and actuated thereby for limiting the upward travel of the die head, the downward movement of the plunger; and the starting of the reciprocation of the loading slide.

l2. In a press of the class described for molding thermo-plastic materials;a vertically movable die head at the upper end thereof; a mold thereon; a die projecting downwardly therefrom; a tiltable swinging delivery i, chute having a vertical wall at one end and opposite sides thereof adapted to be moved beneath said die at each upward movement of said die head; means for tilting said chute during its forwardly swinging movement; and a brush secured tov the vertical end wall of said chute adapted in the swinging movement of said chute to remove surplus material from said die.

- JASPER` DERRY.

EDWIN A. TERKELSEN. 

